Large-scale gravity wave perturbations in the mesopause region above Northern Hemisphere midlatitudes during autumnal equinox: a joint study by the USU Na lidar and Whole Atmosphere Community Climate Model

摘要: Abstract. To investigate gravity wave (GW) perturbations in the midlatitude mesopause region during boreal equinox, 433 h of continuous Na lidar full diurnal cycle temperature measurements September between 2011 and 2015 are utilized to derive monthly profiles GW-induced variance, T′2, potential energy density (PED). Operating at Utah State University (42° N, 112° W), these reveal severe GW dissipation near 90 km, where both parameters drop their minima (∼ 20 K2 ∼ 50 m2 s−2, respectively). The study also shows that GWs with periods 3–5 h dominate summer–winter transition. precise a new tide removal algorithm suitable for all ground-based observations is developed de-trend isolate perturbations. It removes tidal completely provides most accurate observations. This validated by comparing true latest mesoscale-resolving Whole Atmosphere Community Climate Model (WACCM) those derived from WACCM local outputs applying this newly algorithm.